linux-kernel - Re: A quick fio test (was Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3)

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Date:	Tue, 27 Feb 2007 12:29:08 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	Suparna Bhattacharya <suparna@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@....com.au>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ulrich Drepper <drepper@...hat.com>,
	Zach Brown <zach.brown@...cle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Davide Libenzi <davidel@...ilserver.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: A quick fio test (was Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3)

On Tue, Feb 27 2007, Evgeniy Polyakov wrote:
> My two coins:
> # cat job
> [global]
> bs=8k
> size=1g
> direct=0
> ioengine=sync
> iodepth=32
> rw=read
> 
> [file]
> filename=/home/user/test
> 
> sync: 
> READ: io=1,024MiB, aggrb=39,329KiB/s, minb=39,329KiB/s,
> maxb=39,329KiB/s, mint=27301msec, maxt=27301msec
> 
> libaio:
> READ: io=1,024MiB, aggrb=39,435KiB/s, minb=39,435KiB/s,
> maxb=39,435KiB/s, mint=27228msec, maxt=27228msec
> 
> syslet-rw:
> READ: io=1,024MiB, aggrb=29,567KiB/s, minb=29,567KiB/s,
> maxb=29,567KiB/s, mint=36315msec, maxt=36315msec
> 
> During syslet-rw test about 9500 async schduledes happend.
> I use fio-git-20070226150114.tar.gz

That looks pretty pathetic :-). What IO scheduler did you use? syslets
will confuse CFQ currently, so you want to compare with using eg
deadline or as. That is one of the downsides of this approach.

I'll try your test as soon as this bisect series is done.

> P.S. Jens, fio_latest.tar.gz has wrong permissions, it can not be
> opened.

Oh thanks, indeed. It was disabled symlinks that broke it. Fixed now.

-- 
Jens Axboe

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